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Cobalt. Sample of the transition metal cobalt (Co). Cobalt is a hard, silver-white metal that is combined with other metals to make various alloys. It is used to make magnets, pigments, battery electrodes, magnetic recording media, diamond tools, high-speed steels, and cemented carbides. A radioactive isotope of cobalt, cobalt-60, is used as a medical tracer and in the treatment of some forms of cancer.
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